重新评估 class 或使元内部 class 变得懒惰

Question

I genuinely can't figure this out - been working on it for days.

In django I have:

 globalvariablename = "tablename"

 class foo (models.Model):
 # Some attributes I don't care about

     class Meta:
         db_table = globalvariablename

Now it's pretty obvious both foo and Meta will be evaluated once the class is imported / server is instantiated.

Problem: I want db_table to be reassigned once I change globalvariablename value

My question:

• Is there anyway to make the Meta inner class lazy ie for it not to be evaluated until the model is used (eg when data is fetched from the database)?
• Alternatively, is there any way to re-evaluate Meta's db_table attribute once the globalvariablename has changed?

Any help is appreciated. I'm literally pulling my hair out

I've experimented lots with decorators ie for the Meta inner class to be added dynamically. This doesn't work because db_table is already assigned automatically as soon as the model is created and decorating it will just create additional duplicate values of db_table.